Note 3 — Chapter II
Reading edition
The Divine comedy is, under one of its aspects, the Epic of Italian tyranny, so many of its episodes are chosen from the history of the civil wars: Chè le terre d' Italia tutte piene Son di tiranni; ed un Marcel diventa Ogni villan che parteggiando viene.
Those lines occur in the apostrophe to Italy (Purg. vi.) where Dante refers to the Empire, idealized by him as the supreme authority in Europe.